vo: geico. fifteen minutes could save you fifteen percent or more on car insurance. [ sneezing ] she may be muddling through allergies. try zyrtec®. powerful allergy relief for adults and kids six years and older. zyrtec®. love the air. >>> that video captures the terrifies moments, first explosion at the finish line of the boston marathon. fbi and boston police are actively asking the public for any pictures, any video taken at the scene of the marathon explosions. investigators remain on city streets this morning and likely for sometime to come now. law enforcement vowing to do all they can for the city of boston. >> our mission is clear, to bring to justice those responsible for the marathon bombing. the american public wants answers, the citizens of the city of boston and the commonwealth of massachusetts want and deserve answers. >> joining me now from washington, d.c., congressman patrick meehan and michael leiter, former director of the national counterterrorism center. congressman, the